We present results of line searches carried out at 7 mm and 1.3 cm
wavelength, using the Haystack Observatory 37-m antenna. The focus of
this observing campaign was on searches for heavy molecules, with large
moments of inertia, where the partition function of the molecule may
favor observations at low frequencies. A successful detection was made
of the CH OH 7(0)-6(1) A+ transition at 44 GHz, with peak antenna
temperature of approximately 70 mK km/s on March 28, 1997. However,
other searches were unsuccessful, and only upper limits were obtained
for C H 3(2,1)-3(1,2), CS 1-0, CCS 4,3-3,2, HC N 5-4, HC N
18-17, NH 1(1)-1(1), and NH 3(3)-3(3). Three-sigma limits are
13 mK km/s for C H , 8 mK km/s for CCS, 9 mK km/s for HC N, 15
mK km/s for HC N, and 18 mK km/s for NH 3(3)-3(3). Assuming a
rotational temperature of 70 K, the production rate for HC N is log
Q[HC N] < 27.5, consistent with the detection reported by Lis et al. on
IAUC 6566. For CH OH, assuming thermal equilibrium at 100 K,
log Q[CH OH] = 29.5.